My car has been flashing a code 34 for a while now. I really want to get this fixed, but I've been having trouble finding info on this particular code. It seems it is not very common. From what I can tell the most likely cause is a bad diagnostic monitor. I've tried 2 used ones, but ended up with different codes, 12 and 52 IIRC, which leads me to believe the used monitors were bad as well. Any help would be appreciated